1 SPATIAL ASPECTS IN XENAKIS ’ INSTRUMENTAL WORKS

In this paper, Xenakis ’ idea of space which plays an important role in his works will be presented. For two of his compositions with spatial distribution of the musicians, Terretektorh and Persephassa, I have developed a model for spatial analysis which will be illustrated with a few examples taken from these works. In contrast to other starting points this one is not based on mathematics but puts the listener in the focus of attention. The question is: what does the listener really perceive during the performance? After introducing a virtual three-dimensional space as an analytical tool a certain number of spatial environments which constitute the main material of the two pieces will be presented. Afterwards I will show how their succession is essential for the overall structure of these compositions. Finally I will point out the typical aspects of the Xenakian concept and outline his aesthetics of space in combination with his theoretical background and in correspondance to architecture. 1